Zephod [BLOK] (Alpha version)

If you've always wanted to get your hands dirty with modular synthesis but didn't fancy paying for the privilege, check this puppy out. Offering all the synth modules you'd expect (oscillators, filters, envelopes etc) it lets you connect them up via an interface that promises to be easy to use. This Alpha version is free, but the release edition will cost €35.

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KX77FREE Kx-Modulad v2

Another modular synth, this one has just been updated to version 2.0. Additions include a stereo SF2 player, MIDI learn, a new skin and a LP 18 filter. Improvements have been made to existing features, too, and Kx-Modulad still features the WaveTracer, which enables you to make your own additive waveforms.

Christian Budde Lookahead Limiter

Another open-source release from Christian Budde, this peak stop lookahead limiter is said to have a smooth attack envelope and an adjustable release curve. If you don't fancy messing with the settings yourself, there are nine presets to work with.

Cakewalk SFZ+

SFZ+ is designed to do one very specific job - play SoundFonts - but it does it very well. It's multitimbral, has multiple stereo outputs and built-in stereo effects and looks nice too. Having previously been listed at $60, the price on the Cakewalk store has dropped to $0.00 dollars, so give it a look.